Image Resizing for Web and Email

The ideal solution is to use a sinc or lanczos algorithm to avoid moiré artifacts in the downsized image, then follow-up with a very small radius (0.2-0.3) unsharp mask to correct for any interpolation-induced softening. On the other hand, the sinc algorithm is not widely supported and software which uses it is often not as user-friendly.

ImageMagick USM

Sharpening Using Image Magick

Most users will use the unsharp mask filter in the convert command. The option to invoke an unsharp mask looks like this

-unsharp <radius>{x<sigma>}{+<amount>}{+<threshold>}

That is, a radius is expected (or a leading “x” if omitted), followed by optional parameters sigma, amount and threshold. [Note that there is also a -sharpen option to convert. This is not an alias for -unsharp, and (I'm pretty sure) employs a different sharpening routine internally.]

Flickr AnalyticsUpdate: Because of newly discovered US Patent Filing of the Interestingness algorithm, attention has been shifted towards the analysis of this algorithm. Objective Analyze the Flickr Interestingness...

Flickr Interestingness AlgorithmInterestingness is a media (images, videos, etc) ranking algorithm to provide as an additional metric for search results. The algorithm is based upon an algorithm created by the Flickr team, and is...

InterestingnessInterestingness is a media (images, videos, etc) ranking algorithm to provide as an additional metric for search results. The algorithm is based upon an algorithm created by the Flickr team, and is...

Popularity AlgorithmVariables at play Number of votes Record Age Trustworthiness of user who submitted vote Trustworthiness of user who voted Velocity of vote gain over time1 One-mindedness penalized2 Also See ...